How many grams of CaO can be made from 13 5 g of CaCO_3? The balanced reaction i

Question

How many grams of CaO can be made from 13 5 g of CaCO_3? The balanced reaction is: How many grams of Ca_3(PO_4)_2 can be made from 17g g of CaCl_2 and an excess of Na_3PO_4? The balanced reaction is How many grams of AgCl can be made from 25.8 g AgNO_3 and 9.05 g NaCl? The balanced reaction is How many grams of Ca_3(PO_4)_2 can be made from 23 g CaCl_2 and 3 5 g Na_2PO_4? (The other product is NaCl.) Balance: __ C_3H_6 +___ O_2 rightarrow___ CO_2 +___ H_2O How many moles of AgBr are formed if 255 ml of 0 125 M AgNO_3 is added to an excess of NaBr solution? The balanced equation is Report to the proper number of significant figures A cube of Zn that is 1.55 cm on each edge is treated with HC1. The reaction that occurs is Zn + 2 HCl rightarrow ZnCl_2 + H_2. If 6.95 L of H_2 gas is produced, what mass of Zn remains? What are the mass percentages of the elements in C_6H_3NO_2? Report to nearest 0.1% What is the empirical formula of a compound that is 63.2% Mn and 36 8% O? What is the empirical formula of a compound, a sample of which contains 24.6 g K, 23.3 g Cl and 30.2 g O? What is the empirical formula of a compound that contains chromium and oxygen only? A 1, 500 g sample contains 1.03 g chromium.

Explanation / Answer

1)

CaCO3 -------------------------> CaO + CO2

100g                                      56 g

13.5 g                                        ??

100 g CaCO3 -------------------------> 56 g CaO

13.5 g CaCO3 ------------------------> 56 x 13.5 / 100 = 7.56 g

CaO formed = 7.56 g

2)

3CaCl2 --------------------------> Ca3(PO4)2

333 g                                         310.2 g

178 g                                            ?

Ca3(PO4)2 made = 178 x 310.2 / 333

                              = 165.8 g

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